changing ownership while copying file

System

Hi,

we have set up branches for different language versions of the site. Each branch is shared by different unix group only for coresponding country editors. When we copy content from master (english) branch to country branches for translation, we have to change group ownership of files to proper country group. We have use chgrp unix command, however, this creates new version of the file. Is there any way, how to avoid TS creating new version of the file when changing only ownership ?